chore: remove dead code and unused dependencies

- Delete 4 unused files detected by knip
- Remove lint-staged, eslint-config-prettier, plausible-tracker
- Clean up knip.json entry patterns

src/lib/auth/index.ts

@@ -1,19 +0,0 @@
-export {
-	LaravelEncrypter,
-	phpSerializeString,
-	phpUnserializeString,
-} from "./laravel-encrypter";
-export {
-	checkLogin,
-	hashPassword,
-	isMd5Of,
-	type LoginCheck,
-	md5Hex,
-	verifyPassword,
-} from "./password";
-export {
-	generateSsoTicket,
-	issueSsoTicket,
-	type SsoUserUpdater,
-} from "./sso-ticket";
-export { generateTotp, totpKeyUri, verifyTotp } from "./totp";